Purrfecting the art of purring br She does exactly that br our dear imaginative br and near perfect pet cat br We notice that each time br she wants something br the volume and tone of her purr br changes to reflect br her sense of urgency br The higher the pitch br the greater is her need br to spur us into action br to provide her with br the object of her desire br A piece of fish br generally exacts the br highest decibel purr br Its flavour drives br her almost crazy br The purr frequency is lower br for a saucer of milk or water br So the greater the urgency br the less pleasing the purr.